<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div>
        <a href="/">首页</a>
        <a href="/video">视频界面</a>
        <a href="/book">博客界面</a>
        <a href="/login">登录界面</a>

    </div>
    {% block content %}{% endblock %}


</body>

</html>